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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V. Sangaranarayanan
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M.V., Sangaranarayanan
Sangaranarayanan, M. V.
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7 results
Now showing 1 - 7 of 7
- PublicationA sensitive electrochemical detection of progesterone using tin-nanorods modified glassy carbon electrodes: Voltammetric and computational studies(01-03-2018)
;Das, AshisIn recent years, there has been significant interest in the design of electrodes for enhanced electrochemical sensing platforms towards selective and sensitive detection of biological steroid hormones. We report here a facile, template-free electrodeposition of tin nanorods on glassy carbon electrodes and analyse its efficacy for the sensing of progesterone using voltammetric and amperometric techniques. The physicochemical properties of the tin-nanorods modified glassy carbon electrodes are characterized by electron microscopic studies, UV–vis spectral analysis, X-ray diffraction and electrochemical impedance spectroscopy. The mechanism involved in the reduction of progesterone has been elucidated using quantum chemical calculations and the influence of the cationic surfactant (cetyltrimethylammonium bromide) is pointed out. The estimation of progesterone is carried out with differential pulse voltammetry and amperometry. The electrode exhibits an impressive response towards the sensing of progesterone in terms of higher sensitivity, linear calibration regime varying from 40 to 600 μM with the lowest detection limit being 0.12 μM. The effect of other interfering agents such as testosterone, 17β-estradiol, creatinine, uric acid and ascorbic acid is also analysed using differential pulse voltammetry. The analysis of progesterone assay in commercial pharmaceutical formulations has also been carried out and reveals a satisfactory agreement. - PublicationElectrochemical Sensing of Nitrite Ions Using Tin-Submicroparticles Modified Glassy Carbon Electrodes(01-11-2014)
;Sivasubramanian, R.The applicability of tin submicroparticles modified glassy carbon electrodes for sensing of nitrite ions is demonstrated. Tin submicroparticles have been electrodeposited on a glassy carbon electrode using constant potential deposition. The detection of nitrite ions is carried out with differential pulse voltammetry, amperometry and electrochemical impedance spectroscopy. The lowest detection limit of 0.5μM with a linear range of 5μM-1000μM is inferred from the differential pulse voltammetry. The interference from different compounds such as urea, glucose and nitrate ions is also analyzed. - PublicationElectroanalytical Sensor Based on Unmodified Screen-Printed Carbon Electrode for the Determination of Levo-Thyroxine(01-02-2015)
;Das, AshisThe electrochemical behaviour of thyroxine (T4) is analysed using the disposable screen-printed carbon electrode (SPCE) in the neutral phosphate buffer solution with cyclic voltammetric technique. The Differential Pulse Voltammetry and Chronoamperometry were employed for sensing of T4. The lowest detection limit of 3nM was obtained from the differential pulse voltammetric method without preconditioning. The Density Functional Theoretical study of T4 was performed to elucidate the mechanism of oxidation. The analysis of the commercial pharmaceutical samples indicates the validity of the proposed method. - PublicationNon-enzymatic sensing of D-sorbitol using polyaniline-coated stainless steel electrodes(01-10-2016)
;Mondal, Subrata ;Bhanja, PiyaliThe Potentiodynamic deposition of polyaniline on stainless steel electrodes has been carried out using the anionic surfactant sodium tetradecyl sulphate in the presence of acetic acid. The PANI-coated SS electrode was characterized using different spectroscopic and microscopic techniques. The efficacy of the electrode was analyzed for non-enzymatic sensing of D-sorbitol. Amperometric and impedimetric studies reveal the suitability of the electrode for sensing. A detection limit of 5 μM along with a linear range spanning of 75-637 μM and sensitivity of 0.027 μA μM-1 is deduced from the amperometric analysis. - PublicationA facile formation of silver dendrites on indium tin oxide surfaces using electrodeposition and amperometric sensing of hydrazine(05-07-2015)
;Sivasubramanian, R.Silver dendritic structures have been prepared using constant potential deposition on indium tin oxide (ITO) electrodes from an aqueous solution of AgNO3 and KNO3 without any surfactants or structure directing agents. The applied potential is shown to be a crucial factor in the formation of dendrites. Depending upon the magnitude of the applied potentials, morphologies vary from polygons to dendrites. The shape evolution of the silver dendrites has been investigated by varying the deposition time and metal precursors. The mechanism of formation of dendrites is interpreted using the diffusion limited aggregation (DLA) model. The fractal dimensions of the dendrites calculated using the box counting algorithm are in agreement with those predicted by the DLA model. The Ag dendrites coated ITO electrodes exhibit excellent electrocatalytic activity toward oxidation of hydrazine in alkaline medium. The sensing of hydrazine is carried out with amperometry, where from the limit of detection and linear calibration range is deduced as 0.5 μM and 100-1700 μM respectively. The effect of ascorbic acid, urea, ethanol, glucose, K+, Cl-, Br- and I- ions as possible interfering agents in the detection of hydrazine is analyzed. - PublicationA novel non-enzymatic sensor for urea using a polypyrrole-coated platinum electrode(07-01-2013)
;Mondal, SubrataThe potentiodynamic polymerization of pyrrole is carried out on Pt electrodes using sodium dodecyl sulphate and the coated electrode is employed for sensing of urea non-enzymatically. Employing amperometric and impedimetric methods, urea is estimated in mildly acidic conditions. A detection limit of 40 μM is obtained along with a linearity of 80-1440 μM and a sensitivity of 1.11 μA μM-1 cm-2 from the amperometric data. The Nyquist plot is employed for the construction of the calibration curve from the impedance analysis. The interference of different compounds such as ascorbic acid, uric acid, sodium chloride and calcium chloride is also analyzed. © 2012 Elsevier B.V. - PublicationPolypyrrole microfibres synthesized with Quillaja Saponin for sensing of catechol(01-10-2012)
;Ramya, R.The polypyrrole microfibres were synthesized potentiodynamically on platinum electrodes using the natural surfactant Quillaja Saponin. Employing amperometric and impedimetric techniques, the suitability of these electrodes as biosensors for catechol is investigated, in the presence of the enzyme Tyrosinase. The amperometric measurements reveal the linear concentration regime from 1 μM to 400 μM while the upper limit of detection using impedance studies is estimated as 200 μM. The fitting of the Nyquist and Bode' plots is carried to deduce the system parameters. The low magnitude of Michaelis-Menten constant (103 μM) suggests the high activity of the Tyrosinase enzyme. The temporal stability of the electrode has been estimated and the effect of interference from phenol, resorcinol and ascorbic acid is also investigated. © 2012 Elsevier B.V.